Portable tool box



FIG. 1 is a perspective view of a portable tool box showing my new design;

FIG. 2 is a front elevational view thereof; the rear elevational view being a mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a left side elevational view thereof. 

The ornamental design for portable tool box, as shown and described. 